Sherrill Headrick was an American college and Professional Football player from Texas Christian University. In 1960, Headrick came to the American Football League's Dallas Texans as an undrafted linebacker. He went on to star for the Texans and the Kansas City Chiefs. In his first year with the Texans, Headrick set the standard for playing hurt, after fracturing a vertebra in his neck in a pre-game collision at Houston. Despite feeling pain in his neck, he played the entire game. He learned of the fracture five days later, but went on to play the following week, earning the nickname "Psycho". In his book "The American Football League - A Year-by-Year History, 1960-1969" Ed Gruver quotes Texans/Chiefs coach Hank Stram as saying that Headrick, who refused to wear hip pads, had the highest pain threshold [he'd] ever seen in an athlete. Headrick played with a broken neck, infected gums, and a fractured thumb. When an injury left the bone in his finger protruding from the skin, Headrick popped the bones in place without missing a play. The results of these injuries included debilitating arthritis, and he used a wheelchair for the last ten years of his life.